This 1932 letter was written to Edison biographer William A. Simonds by T. A. Richardson, grandson of Joel F. Richardson, who was the superintendent of the Cincinnati railroad office where Edison worked in 1865. The author describes Edisonís experimental apparatus and accomplishments, according to the recollections of his father, T.M. Richardson, and his grandfather.

Courtesy of the Henry Ford Museum and Greenfield Village Research Center.